1601778319201 has 4 divisors (see below), whose sum is σ = 1606004647600. Its totient is φ = 1597551990804.

The previous prime is 1601778319177. The next prime is 1601778319217. The reversal of 1601778319201 is 1029138771061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1601778319201 - 2⁷ = 1601778319073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601778319291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2113163631 + ... + 2113164388.

It is an arithmetic number, because the mean of its divisors is an integer number (401501161900).

Almost surely, 2^{1601778319201} is an apocalyptic number.

It is an amenable number.

1601778319201 is a deficient number, since it is larger than the sum of its proper divisors (4226328399).

1601778319201 is an equidigital number, since it uses as much as digits as its factorization.

1601778319201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4226328398.

The product of its (nonzero) digits is 127008, while the sum is 46.

The spelling of 1601778319201 in words is "one trillion, six hundred one billion, seven hundred seventy-eight million, three hundred nineteen thousand, two hundred one".